Evolution of actinide partitioning with colloidal matter collected at PA “Mayak” site as studied by sequential extraction

A. Novikov; St. Kalmykov; E. Kuzovkina; B. Myasoedov; K. Fujiwara; A. Fujiwara

doi:10.1007/s10967-008-7397-y

Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 280: Issue 3

Evolution of actinide partitioning with colloidal matter collected at PA “Mayak” site as studied by sequential extraction

Authors:

A. Novikov

A. Novikov Vernadsky Institute of Geochemistry and Analytical Chemistry of RAS Kosygin Str., 19 119991 Moscow Russia

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St. Kalmykov

St. Kalmykov Lomonosov Moscow State University Chemistry Department 119991 Leninskie Gory, Moscow Russia

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E. Kuzovkina

E. Kuzovkina Vernadsky Institute of Geochemistry and Analytical Chemistry of RAS Kosygin Str., 19 119991 Moscow Russia

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B. Myasoedov

B. Myasoedov Vernadsky Institute of Geochemistry and Analytical Chemistry of RAS Kosygin Str., 19 119991 Moscow Russia

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K. Fujiwara

K. Fujiwara Radioactive Waste Management Funding and Research Centre 15, Mori Bldg., 2-8-10, Toranomon, Minatoku Tokyo 105-0001 Japan

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, and

A. Fujiwara

A. Fujiwara Radioactive Waste Management Funding and Research Centre 15, Mori Bldg., 2-8-10, Toranomon, Minatoku Tokyo 105-0001 Japan

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Pages:: 629–634

Online Publication Date:: 28 Apr 2009

Publication Date:: 01 Jun 2009

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10967-008-7397-y

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Abstract

Evolution of actinide partitioning to colloids upon subsurface migration in the vicinity of Karachay Lake (PA “Mayak”, Russia) was studied by micro- and ultrafiltration and sequential extraction. Colloidal matter was characterized by SEM-EDX, TEM and photon-correlation spectroscopy. Samples were collected from wells with different redox conditions i.e. from higly oxic to rather reducing. Under oxidizing conditions uranium and neptunium is readily washed out from colloids. Plutonium and americium are present in colloidal matter mainly as hard-soluble species. Under oxidizing conditions plutonium and americium are predominantly bound to organic/mineral fractions (carbonates, oxides and organically bound). Under reducing conditions plutonium and americium are present in immobile refractory fraction. It was also established that uranium and neptunium under reducing conditions behave similarly to plutonium. This phenomenon may be explained by the fact that under reducing conditions and at considerable concentrations of uranium and nitrite-ions these elements form low-soluble An(IV) forms.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)